-my $data = from_json($source);
-my $update = eval { stat(${^LAST_FH} // $ARGV)->mtime }
- or warn "Could not determine input time\n";
-$data->{-date} = Time::Piece->new($update)->datetime;
+my $data = decode_json($source);
+$data->{-date} = Time::Piece->new($_)->datetime
+ for delete $data->{updated} || ();
+
+delete $data->{eras};
+for (values %{ $data->{data} }) {
+ delete @{$_}{qw[ usage_perc_a usage_perc_y ]};
+}
+for (values %{ $data->{agents} }) {
+ delete $_->{usage_global};
+}
+
+while (my ($browser, $target) = each %BROWSERJOIN) {
+ my $agent1 = delete $data->{agents}->{$browser} or next;
+ my $agent2 = $data->{agents}->{$target} or next;
+ push @{ $agent2->{version_list} }, @{ $agent1->{version_list} };
+ $agent2->{browser} = sprintf '%s (former %s)',
+ $agent1->{browser}, $agent2->{browser};
+
+ for (values %{ $data->{data} }) {
+ my $stats = delete $_->{stats}->{$browser} or next;
+ $_ = { %{$_}, %{$stats} } for $_->{stats}->{$target};
+ }
+}
+
+for (values %{ $data->{agents} }) {
+ $_->{versions} = [ map { $_->{version} } @{ $_->{version_list} } ];
+}